Harrow-disk.



PATENTBD APR. 9

J. R. GRIGG.

HARROW DISK.

APPLICATION FILED AUg.1o.19os.

JAMES R. GRIGG, OF ARAPAHO, OKLAHOMA TERRITORY.

HARBOW-DISK.

Specification of Letters Patent.

Patented April 9, 1907.

Application filed August 10, 1906. Serial No. 330,078.

.['0 all whom it may concern:

Be it known that I, JAMES R. GRIGG, a citizen of the United States,residing at Arapaho, in the county of Custer and Territory of Oklahoma,have invented certain new and useful Improvements in Harrow-Disks, ofwhich the following is a specification.

The object ofthis invention is to provide a novel form of disk forharrows or similar agricultural implements, the essential feature of theinvention residing in the peculiar and exact structure of the disk,whereby the thorough cultivation of the earth or soil operated uponthereby is facilitated.

A disk comprising the invention is of the type embodying the usual earthor soil working body from which extend a number of teeth or points eachof which is of a peculiar form per se and which are peculiarly formedwith the earth-working body above mentioned, as.will be pointed out moreclearly hereinafter and as is shown clearly in the drawings.

For a full understanding of the invention and the merits thereof andalso to acquire a knowledge of the details of construction of the meansfor effecting the result reference is to be had to the followingdescription and accompanying drawings, in which Figure 1 is an elevationof a disk embodying the invention looking toward the concave sidethereof. Fig. 2 is a vertical sectional view. Fig. 3 is a transversesection through one of the teeth or taken on the line a: a; of Fi 1.

Oorresponding and like parts are referred to in the followingdescription and indicated in all the views of, the drawings by the samereference characters.

Specifically describing the invention, the numeral 1 designates the bodyof the disk, and this body is of concavo-convex form, as is customary inthe construction and manufacture of earth-treating means of this class.The earth-working body 1, above mentioned, is provided centrally thereofwith a square or like 0 ening 2, adapted to fit upon the shaft whichcarries the gangs of the disks comprising the invention in the actualuse of the invention. Projecting from the peripheral portion of the body1 of the disk are the points or teeth 3, each of which is of concaveform in cross-section or transverse extent and each of which is oftriangular shape in general conformation. The teeth or points 3 areintegrally formed with the earth-working body 1 of the disk and areradial with respect thereto, the opposite edge portion of each toothextending at the same angle with reference to the earth-working body 1,and the two edges of each tooth diverge toward the body 1 or point ofintegrality therewith.

In the actual manufacture of the invention a disk comprising the samemay be formed out of pressed metal, and the concave portions of eachtooth 3 form continuations of the concaved portion of the earth-workingbody 1 of the disk.

The peculiar formation of the disk, as herebefore set forth, isespecially advantageous from the standpoint of actual results attainedin the use of the device, the disks when in use in gangs beingconstructed so as to culitvate all classes of meadow lands and fields,increasing the production of the same materially over the more commontypes of disks at present in use.

So far as action of the disk with reference to the earth operated onthereby is concerned especial attention is directed to the fact that thestructure is advantageous for the cultivation of alfalfa meadows, forthe reason that the points of the disk will penetrate the ground orearth between the plants and loosen said earth without injuring saidplants. This action is not performed by any other disks at present inuse, so far as I am aware, and is extremely important, as it is -wellknown that the earth of alfalfa lands becomes hard and compact, and itis extremely difficult to cultivate the same by using the round orcommon disk, as the latter cuts and scrapes off the crowns of the plantsand injures them materially.

The use of my invention obviates the above difficulties anddisadvantages. Of course my disk may be used in gangs and in variouswith their side edges converging to points at ways, and the number' ofpoints, as Well as the theirouter ends, each of said'teet'h beingconsize of the disks, may be varied at will. cavo-conveX in transversesection through- Havlng thusdescribed-the-invention,What out its extent.5 is claimed 'a's'new 1s ln'testimony Whereof'I affix my signature 15 Asan improved article of manufacture, inpresence of two Witnesses. theherein-described disk for agricultural JAMES R. GRIGG. [L. s.]implements, the same comprising a central Witnesses: earth workingbodyof concavo-convexiorm, WALTER S. MILLS, 1c and teeth radiating fromthe central body J. AJCA'RLBERG.

